Improvement in chair-bases



W. T. DU R EM U S.

Chair Bases.

Patented July 20,1875.

.m E S S E N H W ATTUBNEYS.

WILLIAM T. DOREMUS, OF NEW YORK, N. Y.

IMPROVEMENT IN CHAIR-BASES.

Specification forming part of Letters Patent N 0. 165317, dated July 20,1875; application filed March 13, 1875.

To all whom it may concern:

Be it known that I, WILLIAM T. DORE- MUS, of the city, county, and Stateof New York, have invented a new and useful Improvement in'Ohair-Base,of which the followin g is a specification:

Figure l is a vertical cross-section of my improved chair-base, takenthrough the line w 00, Fig. 2. Fig. 2 is a top view of the same, partlyin horizontal section, through the line y y, Fig. 1. Fig. 3 is a detailtop view of the lower plate. Fig. at is a side view of the two plates,looking in the direction of arrow 2, Fig. 2. Fig. 5 is a detail sectionof one of the legs, taken through the line 2 z, Fig. 1.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish an improved base for pivotand screw chairs, which shall be siniple in construction, inexpensive inmanufacture, easily put together and taken apart, and strong anddurable.

The invention will first be fully described, and then pointed out in theclaims.

A and B are two plates, which are made with a socket through theircenters to receive the pivot or screw. The plates A B are made withangular half-sockets in their adjacent sides, which, when the saidplates are bolted together, form square sockets, arranged diagonally, asshown in Fig. A. The plates A B are made exactly alike, except that thehalf-sockets of the upper plate project somewhat farther than thehalf-socket of the lower plate, as shown in Figs. 1, 2, 3,

and A.

In the flat parts of the plates, between the sockets, are formed holes ab to receive the bolts F, by which the said plates are bolted together.The bolts F may, however, be passed through the angular half-sockets andthrough the upper part D of the legs D E. In this case the bolt-holesshould be made through one or both the pins a b to avoid weakening thecasting. This construction allows the parts of the plates A B betweenthe half-sockets to be made lighter than when the bolt-holes a b areformed through them.

The sockets are made radial, and may be horizontal or inclined at agreater or less angle, as may be desired.

0 is the pivot, which is made tubular, and the upper part of which isexpanded or flared into funnel shape, as shown in Fig. l. The upper endof the pivot G is designed to have lugs or spring-rests cast upon itsupper end, to enable the chair-seat to be attached to or connected withit. D E are the legs, which are made in two parts, jointed to each otherby two or three tongues and grooves, which are made deep at their outerends, and taper to nothing at their inner ends, as shown in Fig. 5.

The joint is put together with glue, and is further secured by a pin orscrew, as shown in Figs. 1 and 5. This construction leaves the upperparts D of the legs strong, and makes them less liable to break than itthe grooves and tongues were made deep at their inner ends. Thisconstruction also renders the legs much less liable to be broken by sidestrain, side pressure, or an accidental blow.

1n the socket-angles of the plates A B are cast pins a b which enter theupper and lower corner of the upper part D of the legs, and thus preventsaid legs from drawing out. In the outer part of the socket-angles ofthe upper plate and in the inner part of the socket-angles of the lowerplate are formed holes n b to receive screws for still further securingthe upper parts D of the legs D E in their sockets.

WVhen a screw-chair is required, a screwthread is out on the outersurface of the hollow pivot C, and in the inner'surface of the centralsocket.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The plates A B, made with a central sockettoreceive the pivot or screw, and with angular half-sockets to receive thelegs, and provided with pins and screw-holes for securing said legs inplace, substantially as herein shown anddescribed.

2. The legs D E, made in two parts,jointed to each other by two or moretapering tongues and grooves, substantially as herein shown anddescribed.

3. The hollow pins a W, cast in the angles of the halt-sockets of theplates A B, to adapt them to receive bolts for securing the legs in saidsockets, and clamping the plates to each other and to the legs,substantially as herein shown and described.

WILLIAM T. DOREMUS.

Witnesses:

JAMES T. GRAHAM, T. B. MOSHER.

